First results from a 1.1-m-diameter superconducting monopole detector
J. Incandela, H. Frisch, S. Somalwar, M. Kuchnir, H. R. Gustafson
DOI 10.1103/PhysRevD.34.2637 · Physical Review D
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Abstract
We present the design and performance of a superconducting induction magnetic-monopole detector with 1.1-m-diameter gradiometer loops. The detector demonstrates that gradiometers can be overlapped with no mutual inductance to yield high redundancy without increasing shield volume. One of two detector units was sensitive to the passage of monopoles through two overlapped gradiometers with 98% coincidence efficiency for 161 hours. The unit has a coincident sensitive area averaged over 4π sr of 4400 cm2. No candidate events were observed, setting an upper limit on the flux of cosmic-ray magnetic monopoles of f≲7.1×10−11 cm−2 sr−1 sec−1 (90% C.L.). The detector was operated in ambient magnetic fields of ∼5–125 mG.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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